v14 - Backup su server FTP

[AronStocker]

Buongiorno,
il backup su server FTP esterno non funziona in quanto viene restituito un messaggio d'errore:

An exception occurred BackupAndRetoreForm Error: System.Net.WebException: The remote server returned an error: (553) File name not allowed.
at System.Net.FtpWebRequest.CheckError()
at System.Net.FtpWebRequest.SyncRequestCallback(Object obj)
at System.IO.Stream.Close()
at System.Net.ConnectionPool.Destroy(PooledStream pooledStream)
at System.Net.ConnectionPool.PutConnection(PooledStream pooledStream, Object owningObject, Int32 creationTimeout, Boolean canReuse)
at System.Net.FtpWebRequest.FinishRequestStage(RequestStage stage)
at System.Net.FtpWebRequest.GetRequestStream()
at WebGuilnterface.BackupAndRetoreFonn.BackupNo\•t( String file, BackupConfig options)

qualche idea?